[INFO] fetching crate dardan_ui 0.1.1...
[INFO] testing dardan_ui-0.1.1 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate dardan_ui 0.1.1 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate dardan_ui 0.1.1 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate dardan_ui 0.1.1
[INFO] finished tweaking crates.io crate dardan_ui 0.1.1
[INFO] tweaked toml for crates.io crate dardan_ui 0.1.1 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded sdl2-sys v0.31.0
[INFO] [stderr]   Downloaded sdl2 v0.31.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 04b7aec27308ec0f2233d89b14e8faf85d8724c0608eedc91d7fdd2f49d0acd9
[INFO] running `Command { std: "docker" "start" "-a" "04b7aec27308ec0f2233d89b14e8faf85d8724c0608eedc91d7fdd2f49d0acd9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "04b7aec27308ec0f2233d89b14e8faf85d8724c0608eedc91d7fdd2f49d0acd9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04b7aec27308ec0f2233d89b14e8faf85d8724c0608eedc91d7fdd2f49d0acd9", kill_on_drop: false }`
[INFO] [stdout] 04b7aec27308ec0f2233d89b14e8faf85d8724c0608eedc91d7fdd2f49d0acd9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 61a563257605177f9e47781f6c726fce5f34669c58d8ffc9da88352d11b1f6e3
[INFO] running `Command { std: "docker" "start" "-a" "61a563257605177f9e47781f6c726fce5f34669c58d8ffc9da88352d11b1f6e3", kill_on_drop: false }`
[INFO] [stderr]    Compiling sdl2-sys v0.31.0
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling sdl2 v0.31.0
[INFO] [stderr]    Compiling dardan_ui v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/base/param.rs:5:18
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Child(UiCell<UiElem>),
[INFO] [stdout]   |                  ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/app.rs:16:26
[INFO] [stdout]    |
[INFO] [stdout] 16 |     main_element: UiCell<UiElem>,
[INFO] [stdout]    |                          ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/app.rs:38:61
[INFO] [stdout]    |
[INFO] [stdout] 38 |     pub fn set_main_element(&mut self, main_element: UiCell<UiElem>) {
[INFO] [stdout]    |                                                             ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/elements/horizontal.rs:4:26
[INFO] [stdout]   |
[INFO] [stdout] 4 |     elements: Vec<UiCell<UiElem>>,
[INFO] [stdout]   |                          ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/elements/horizontal.rs:20:47
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn add_child(&mut self, child: UiCell<UiElem>) {
[INFO] [stdout]    |                                               ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.78s
[INFO] running `Command { std: "docker" "inspect" "61a563257605177f9e47781f6c726fce5f34669c58d8ffc9da88352d11b1f6e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61a563257605177f9e47781f6c726fce5f34669c58d8ffc9da88352d11b1f6e3", kill_on_drop: false }`
[INFO] [stdout] 61a563257605177f9e47781f6c726fce5f34669c58d8ffc9da88352d11b1f6e3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e2f7af1ca503c3f0154f54164cfbbc630b3dbfba03db302b9b6631c926346661
[INFO] running `Command { std: "docker" "start" "-a" "e2f7af1ca503c3f0154f54164cfbbc630b3dbfba03db302b9b6631c926346661", kill_on_drop: false }`
[INFO] [stderr]    Compiling dardan_ui v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/base/param.rs:5:18
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Child(UiCell<UiElem>),
[INFO] [stdout]   |                  ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/app.rs:16:26
[INFO] [stdout]    |
[INFO] [stdout] 16 |     main_element: UiCell<UiElem>,
[INFO] [stdout]    |                          ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/app.rs:38:61
[INFO] [stdout]    |
[INFO] [stdout] 38 |     pub fn set_main_element(&mut self, main_element: UiCell<UiElem>) {
[INFO] [stdout]    |                                                             ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/elements/horizontal.rs:4:26
[INFO] [stdout]   |
[INFO] [stdout] 4 |     elements: Vec<UiCell<UiElem>>,
[INFO] [stdout]   |                          ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/elements/horizontal.rs:20:47
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn add_child(&mut self, child: UiCell<UiElem>) {
[INFO] [stdout]    |                                               ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/base/param.rs:5:18
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Child(UiCell<UiElem>),
[INFO] [stdout]   |                  ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/app.rs:16:26
[INFO] [stdout]    |
[INFO] [stdout] 16 |     main_element: UiCell<UiElem>,
[INFO] [stdout]    |                          ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/app.rs:38:61
[INFO] [stdout]    |
[INFO] [stdout] 38 |     pub fn set_main_element(&mut self, main_element: UiCell<UiElem>) {
[INFO] [stdout]    |                                                             ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/elements/horizontal.rs:4:26
[INFO] [stdout]   |
[INFO] [stdout] 4 |     elements: Vec<UiCell<UiElem>>,
[INFO] [stdout]   |                          ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/elements/horizontal.rs:20:47
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn add_child(&mut self, child: UiCell<UiElem>) {
[INFO] [stdout]    |                                               ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.23s
[INFO] running `Command { std: "docker" "inspect" "e2f7af1ca503c3f0154f54164cfbbc630b3dbfba03db302b9b6631c926346661", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e2f7af1ca503c3f0154f54164cfbbc630b3dbfba03db302b9b6631c926346661", kill_on_drop: false }`
[INFO] [stdout] e2f7af1ca503c3f0154f54164cfbbc630b3dbfba03db302b9b6631c926346661
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 01f3db3fbdc0c19cea0c218155731d4cae57f1705f31949607007747b65b9111
[INFO] running `Command { std: "docker" "start" "-a" "01f3db3fbdc0c19cea0c218155731d4cae57f1705f31949607007747b65b9111", kill_on_drop: false }`
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/base/param.rs:5:18
[INFO] [stderr]   |
[INFO] [stderr] 5 |     Child(UiCell<UiElem>),
[INFO] [stderr]   |                  ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr]   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/app.rs:16:26
[INFO] [stderr]    |
[INFO] [stderr] 16 |     main_element: UiCell<UiElem>,
[INFO] [stderr]    |                          ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/app.rs:38:61
[INFO] [stderr]    |
[INFO] [stderr] 38 |     pub fn set_main_element(&mut self, main_element: UiCell<UiElem>) {
[INFO] [stderr]    |                                                             ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/elements/horizontal.rs:4:26
[INFO] [stderr]   |
[INFO] [stderr] 4 |     elements: Vec<UiCell<UiElem>>,
[INFO] [stderr]   |                          ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/elements/horizontal.rs:20:47
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub fn add_child(&mut self, child: UiCell<UiElem>) {
[INFO] [stderr]    |                                               ^^^^^^ help: use `dyn`: `dyn UiElem`
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] 
[INFO] [stderr] warning: `dardan_ui` (lib) generated 5 warnings
[INFO] [stderr] warning: `dardan_ui` (lib test) generated 5 warnings (5 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/dardan_ui-aafda2eefdc201cd)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests dardan_ui
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "01f3db3fbdc0c19cea0c218155731d4cae57f1705f31949607007747b65b9111", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01f3db3fbdc0c19cea0c218155731d4cae57f1705f31949607007747b65b9111", kill_on_drop: false }`
[INFO] [stdout] 01f3db3fbdc0c19cea0c218155731d4cae57f1705f31949607007747b65b9111